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A new lithium‐ether‐derived chelate ionic liquid is synthesized to serve as an electrolyte for the Li‐O 2 battery that is stable to metallic lithium, and whose ethereal framework is much more inherently stable to superoxide‐initiated hydrogen abstraction than the simple glyme, dimethoxyethane (DME). Reactions of chemically generated superoxide with this electrolyte show that virtually no decomposition products such as lithium formate are generated. When the electrolyte is employed in a Li‐O 2 battery, a ten‐fold decrease in CO 2 evolution is evident on charge by comparison to DME and greatly enhanced cycling stability is observed with TiC as a cathode support. A mechanism is proposed to account for the lowered reactivity, offering new insight into the stability of organic electrolytes in Li‐O 2 batteries. This approach for electrolyte design is presented here for the first time, and it can be extended to other organic systems to provide a platform for the design of advanced electrolyte systems.
Adams et al. (Thu,) studied this question.
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